[Bug 82634] [snb] backlight issue on TOSHIBA PORTEGE R830 after suspend/resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82634

--- Comment #24 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
Hi,

(In reply to Sylvain Pasche from comment #23)
> (In reply to Hans de Goede from comment #22)
> > Sylvain, do you still have an xorg.conf file hanging around telling the
> > intel ddx to use the intel_backlight interface? Can you try running the
> > latest Fedora-22 kernel without such a file and without any special kernel
> > commandline arguments? If that does not help then I'm afraid I'm all out of
> > ideas and one of the intel devs will need to look at reg-dumps and figure
> > out what exactly is going on at a much lower level.
> 
> Hi Hans. I didn't have a xorg.conf file lying around. In fact, I also tested
> with the Fedora Workstation 22 installation DVD to make sure that I have
> nothing interfering. In this situation, I have the behavior described above:
> * two backlight interfaces are exposed: acpi_video0 and intel_backlight
> * they both work after boot
> * after suspend / resume, only the intel_backlight interface works
> * backlight is turned on after boot or resume

Ok, so while working on some other backlight stuff my mind drifted to this bug,
and I think I've a solution for it now. It is not really pretty, but hopefully
I will be able to sell it to the other upstream kernel devs.

But first lets see if it actually works :)

I've started another Fedora-22 scratch kernel build, with another patch (which
I will attach shortly):
http://koji.fedoraproject.org/koji/taskinfo?taskID=9945627

This is still building atm, but give it a try when it has finished building and
let me know if that fixes things for you (I think it will).

Regards,

Hans

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